Spark arrester and quencher



SPARK APPL ; EVANS.

ER AND QUENCHER. ILED SEPT.9.1919.

Patented Jan. 27, 1920.

2 SHEETS-SHEET I- 4 INVENTOR war flliwns A B I d ORNEYS E. A. EVANS.

SPARK ARRESTER AND QUENCHER. APPLICATION FILED SEPT. 9. 1919.

Patented Jan. 27, 1920.

2 SHEETS-SHEET 2- INVENTOR .ZZZLJ/(ZT' filiana EDGAR A. EVANS, 0Z5VICTORIA, COLUMBIA, CANADA.

SPARK AEBESTEE AND QUENGI-IER.

Application riled September 1919.

To all whom it may concern:

Be it known that 1, linear, A. EvANs, a citizen of the United States,residing at Victoria, in the Province of British Columbia, Canada, haveinvented certain new and useful Improvements in Spark rrrresters andQuenchers, of which the following is a specification.

This invention relates to a means for arresting and quenching sparks asdelivered in the smoke-stack of a steam generating boiler or the like,and is particularly de signed for application to boilers as used inlumber camps or elsewhere having readily inflammable surroundings.

The invention is particularly described in the following specification,reference being made to the drawings by which it is accompanied, inwhich:

Figure l is a general view of the boiler showing the application or" thespark quenching device and its attendant parts.

Fig. 2 is a vertical section to an enlarged scale of the spark quenchingdevice to the head of the smoke-stack, and

Fig. 3 is a horizontal section on the line 33 in Fig. 2.

In these drawings 2 represents a steam generating boiler, and 3 itssmoke-stack. To the head of the smoke-stack is secured on a suitablelight metal frame a frusto-conical mesh screen 5. The smaller end ofthis screen is directed upward and has a circular opening 6 and thelower end projects concentrically beyond the circle of the smokestack,leaving an annular open space T. Gutside of this screen 5 is supportedon a suitable frame a conoidal outer screen 9 and within this screen 9is a coil 10 of metal pipe having small apertures at intervals apartdirected upward and inward against the inner screen 5, the axes of thejets, preferably, being approximately tangential to the surface of thescreen at their points of contact therewith.

Through this Perforated pipe 10 water is delivered under pressure withthe object that the water spray will quench the sparks as delivered fromthe smoke-stack.

As a water service under pressure is not generally available in loggingcamps, the desired object is attained by delivering the water to a pipe11 from an injector 12, the water being drawn from a water tank 13 towhich the service water is delivered. The injector may be operated bysteam direct from Specification of Letters Patent.

Patented Jan. 27, 1920.

Serial No. 322,717.

the boiler, a very small jet of which will be suliicient for thepurpose, but preferably by compressed air from av reservoir lat intowhich it is compressed by a direct acting steam-operated pump 15.

The essential feature of the invention lies in the delivery of a waterspray against the spark arresting screen.

I do not desire to be confined to the particular form of spark arrestingscreen or screens used, nor to the manner here shown delivering thewater.

its the loppings and trimmings of forest trees about logging camps dryup, they become very inflammable, and the loggers are anxious to takeevery precaution to prevent fire, as if the fire runs through theirlimits, their available timber supply is lost. Spark arresters are inthemselves of little protection, as if a boiler fire of a logging engineis forced, the sparks will be driven through the screen and maybeca-rried by the wind into inflammable brush.

With this device no live sparks can be projected from the screen. Theyare immediately quenched by the water spray as they are projected fromthe smoke-stack, either as hey pass through the screen or are retainedby it.

The provision of a double screen is not an essential, but is believed tobe a desirable feature.

Having now particularly described my invention, I hereby declare thatwhat I claim as new and desire to be protected in by Letters Patent, is:

1. The combination with the upper end of a smoke-stack, of means fordelivering a finely divided spray of wa er across the exit area of it.

2. The combination with the upper end of a smoke-stack and a sparkarresting screen thereover, of means for delivering a finely dividedspray of water inward onto the screen.

3. The combination with the vtop of a smoke-stack and a spark arrestingscreen thereorer, of means for delivering fine jets of water underpressure inward onto the screen the axes of the jets being approximatelytangential to the surface of the screen at their points of contacttherewith.

4c. The combination with the top of a smoke-stack, of a frusto-conicalscreen, the base of which. is concentric with and outside the circle ofthe smoke-stack and the upper lOO end of which is relatively smaller indiameter than the smoke-stack, and a coil of pipe spirally disposedaround the outside of the screen and finely apertured around the innerside the axes of the apertures being directed upward and inward tobeapproximately tangential to the surface of the conical screen at theirplaces of contact.

5. The combination with the top of a smoke-stack, of a screen extendingfrom a ring secured to the top of the smoke-stack to be concentricoutside the same, to a ring concentric with the smoke-stack but ofrelatively smaller diameter, an outer screen conforming generally to thefirst named screen and inclosing the upper open end, and a coil of pipebent spirally around the inner side of the outer screen and finelyapertured at intervals apart, and meansfor delivering water underpressure to the pipe coil to direct a finely divided spray into thespace between the screens.

6. The combination with the top of a smoke-stack of a screen extendingfrom a ring secured to the top of the smoke-stack to be concentricoutside the same, to a ring concentric with the smoke-stack but ofrelaively smaller diameter, an outer screen conforming generally to thefirst named screen and inclosing the upper open end, and a coil of pipebent spirally around the inner side of the outer screen and finelyapertured at intervals apart, the axes of the apertures beingapproximately tangential to the surface of the inner screen at theirplaces of contact therewith, and means for delivering water underpressure to the pipe coil to direct a finely divided spray into thespace between the screens.

7. The combination with the top of a smokestack and a spark arrestingscreen thereover, of a coil of pipe outside the screen, said pipeprovided with small apertures along its inner side directed toward thescreen and means for delivering water under pressure to the perforatedpipe.

In testimony whereof I aflix my si nature.

EDGAR A. Evans.

